Dear Juan,
You also write:
4) why large publishers as Elsevier are using an in-house
modification of
MathML instead the official recommendation.
Large publishers often use customizations of software and specs in-
house,
as do many small ones as well. ISO 12083 was widely criticized in
public as
unworkable in production streams without extensive modification. That's
part of the reason that MathML was welcomed by publishers.
I'd be interested as to the source of your comments about the internal
details of Elsevier's publishing stream. Do you suggest that all STM
material is treated the same by them, or are there variations over the
range of offerings?
Patrick